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BALANCES AND TRANSACTIONS WITH COMPANIES UNDER SECTION 33 - LAW No. 19,550 AND RELATED PARTIES - Key Managers (Details) - ARS ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
BALANCES AND TRANSACTIONS WITH COMPANIES UNDER SECTION 33 - LAW No. 19,550 AND RELATED PARTIES
Social security contributions	$ 800.0	$ 324.0	$ 77.0
Amount payable under compensation for Key Managers	270.0
Estimated compensation	$ 110.0
Compensation for members of Board of Directors		$ 83.0	$ 13.0

X

- Definition

The amount of remuneration paid or payable to the entity's directors.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

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Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of estimated compensation for board of directors.

+ References

No definition available.

+ Details

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Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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X

- Definition

The amount of unpaid compensation for key management personnel.

+ References

No definition available.

+ Details

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Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The amount of compensation to key management personnel in the form of social security contributions.

+ References

No definition available.

+ Details

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Namespace Prefix:	teo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration